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<head><meta charset="utf-8"><title>LLVM apfloat problem · t-compiler/wg-llvm · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/index.html">t-compiler/wg-llvm</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.20apfloat.20problem.html">LLVM apfloat problem</a></h3>

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<a name="205613784"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%20apfloat%20problem/near/205613784" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> RalfJ <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.20apfloat.20problem.html#205613784">(Jul 31 2020 at 16:49)</a>:</h4>
<p>It would be great if someone knowledgeable in matters of LLVM and floating point could take a look at <a href="https://github.com/rust-lang/rust/issues/69532">https://github.com/rust-lang/rust/issues/69532</a> -- this is a Rust CTFE/Miri bug (programs executing the wrong way) caused by the Rust port of LLVM's libapfloat, and from all we can tell original apfloat has the same problem, so it would be good to report this upstream. But not knowing float arithmetic very well at all, I don't feel comfortable reporting this.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%20apfloat%20problem/near/205634422" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.20apfloat.20problem.html#205634422">(Jul 31 2020 at 19:50)</a>:</h4>
<p>/me opens a tab...</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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